Originally Posted by
OLDYELLR
I have a mid-eighties ladies' Miyata 310 with the seat post stamped 26.7, about 220mm long. The sticker on the seat tube says "MIYATA Cr-Mo CHROME MOLYBDENUM DOUBLE BUTTED TUBES"
I have a 1984 men's Miyata 310 and the seat post is also stamped 26.7; very strange size.